Speciation analysis of arsenic( Ⅲ ) and arsenic( Ⅴ ) in environmental water samples with mutiwalled carbon nanotubes preconcention/separation cartridge prior to hydride generation atomic fluorescence spectrometry
- 作者：Cheng xianzhongHu cunjieTong zhongzeHu shencaiShao kun
- 会议时间：2009-11-01
- 关键词：Hydride generation atomic fluorescence spectrometry ( HG - AFS) ; Solid - phase extraction ; multi - walled carbon nanotubes ( MWNTs) ; Speciation analysis ; Arsenic ( Ⅲ ; Ⅴ)
- 作者单位：Cheng xianzhong,Tong zhongze,Hu shencai(School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, P. R. China, 430023)Hu cunjie(Department of Materials and Chemistry Engineering, Guilin University of Technology, Guilin, P. R. China, 541004)Shao kun(Scho)
- 母体文献：第十三届世界湖泊大会论文集
- 会议名称：第十三届世界湖泊大会
- 会议地点：武汉
- 主办单位：中国环境科学学会
- 语种：chi
摘要
A simple,inexpensive,and sensitive method was developed for the determination of inorganic arsenic species As (Ⅲ),As(Ⅴ) and total As in environmental water samples using multiwalled carbon nanotubes (MWCNTs) as solid phase extraction(SPE) adsorbents coupled with hydride generation atomic flourescence spectrometry ( HG - AFS).The procedure is based on selectively absorbance of the chelates of As(Ⅲ) - ammonium pyrrolidine dithiocarbamate (APDC) on the MWCNTs with a pH range of 0.5 ~ 4.0,while As (Ⅴ) was passed through the microcolumn without the retention due to the preconcentration efficiency of As(Ⅴ) -APDC complex was very low and changed a litter.The retention complexs of As(Ⅲ) -APDC was eluted completely with 3 mL of 2.0 mol · L-1 HCl solution at a flow rate 1.0 mL · min - 1,and then directly determined by HG - AFS.The effluent of As(Ⅴ) was determined using thiourea and ascorbic acid as reducing agent for reduce As(Ⅴ) to As(Ⅲ).Total arsenic was determined after acid digestion with HCl∶ HNO3 (3 ∶ 1 ) in open vessel,and then the mixture solution of thiourea and ascorbic acid were added in the digestion solution for reducing As (Ⅴ) to As (Ⅲ).The different parameters that control the preconcention/separation step of As(Ⅲ) and As(Ⅴ) and determination have been investigated in detail.Under the optimized conditions,the detection limits of this method for As (Ⅲ) were 0.0062 ng · mL-1 with an enrichment factor of 27,and the relative standard deviations for As(Ⅲ) and As(Ⅴ) were 0.46% ~ 6.30%.The proposed method was applied for the analysis of inorganic arsenic species in groundwater and lake water with the recovery of 96.8 - 102.8%.